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LT6109AIMS-2#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LT6109-1/LT6109-2
22
610912fa
APPLICATIONS INFORMATIONAPPLICATIONS INFORMATION
–
+
V
+
V
+
V
–
INC
V
–
5
V
D
+
–
V
OUTA
+
–
610912 F17
OUTA 8
9
6
V
+
V
+
SENSEHI
LT6109-1
R
IN
R
SENSE
I
LOAD
V
DD
V
DD
SENSELO
OUTC4
EN/RST
2
1
10
400mV
REFERENCE
R3
R1
R2
V
DD
–
+
Figure 17. Schottky Prevents Damage During Supply Reversal
TYPICAL APPLICATIONS
Overcurrent and Undervoltage Battery Fault Protection
SENSEHI SENSELO
OUTA
0.1Ω
R10
100Ω
LT6109-1
V
–
TO
LOAD
V
OUT
9.53k
475Ω
30V
UNDERVOLTAGE
DETECTION
0.8A
OVERCURRENT
DETECTION
INC1
INC2
V
+
EN/RST
OUTC2
8
1
6
7
5
OUTC1
10
9
10k
100k
6.2V*
IRF9640
2
5V
INC2
3
4
RESET
6109 TA02
100k
2N7000
*CMH25234B
1M
13.3k
+
+
+
+
0.1µF
10µF
12 LITHIUM
40V CELL STACK
The comparators monitor for overcurrent and undervolt-
age conditions. If either fault condition is detected the
battery will immediately be disconnected from the load.
The latching comparator outputs ensure the battery stays
disconnected from the load until an outside source resets
the LT6109 comparator outputs.
LT6109-1/LT6109-2
23
610912fa
TYPICAL APPLICATIONS
MCU Interfacing with Hardware Interupts
SENSEHI SENSELO
OUTA
0.1Ω
V
+
100Ω
LT6109-1
V
–
TO LOAD
V
OUT
ADC IN
2k
6.65k
INC2
1.33k
INC1
V
+
EN/RST
OUTC1
8
1
7
6
5
OUTC2
10
9
10k
2
5V
4
3
RESET
6109 TA03
10k
5V
V
OUT
/ADC IN
AtMega1280
PB0
PB1
PCINT2
PCINT3
ADC2
PB5
5
6
7
2
3
1
UNDERCURRENT ROUTINE
RESET COMPARATORS
MCU INTERUPT
OUTC2 GOES LOW
5V
0V
610912 TA03b
Example:
The comparators are set to have a 50mA undercurrent
threshold and a 300mA overcurrent threshold. The MCU
will receive the comparator outputs as hardware interrupts
and immediately run an appropriate fault routine.
Simplified DC Motor Torque Control
The figure shows a simplified DC motor control circuit.
The circuit controls motor current, which is proportional
to motor torque; the LT6109 is used to provide current
feedback to a difference amplifier that controls the current
in the motor. The LTC
®
6992 is used to convert the output
of the difference amp to the motors PWM control signal.
SENSEHI SENSELO
OUTA
LT6109
V
–
5.62k
100k
2
3
7
LTC6246
1µF
4
6
1
3
6
IRF640
5V
1N5818
0.1Ω
V
MOTOR
5
4
2
0.47µF
V
OUT
CURRENT SET POINT (0V TO 5V)
3.4k
1k
INC2
1M
610912 TA04
1k
78.7k
100k
280k
INC1
V
+
EN/RST
OUTC1
OUTC2
RESET
100µF
+
–
LTC6992-1
V
+
GND
5V
BRUSHED
DC MOTOR
(0A TO 5A)
MABUCHI
RS-540SH
MOD
SET
OUT
DIV
LT6109-1/LT6109-2
24
610912fa
TYPICAL APPLICATIONSTYPICAL APPLICATIONS
Power-On Reset or Disconnect Using a TimerBlox
®
Circuit
–
+
–
+
V
–
V
+
V
+
V
–
–
+
V
–
5
INC1
610912 TA06
V
+
400mV
REFERENCE
V
+
R
IN
100Ω
R
SENSE
I
LOAD
R5
10k
INC2
OUTA
6
7
8
9
SENSEHI
LT6109-1
5V
SENSELO
OUTC2
OUTC1
EN/RST
10
1
3
4
2
R1
8.06k
R2
1.5k
R3
499Ω
R4
10k
R7
1M
R6
487k
R8
30k
TRIG
C1
0.1µF
Q1
2N2222
OUT
GND V
+
SET DIV
LTC6993-3
5V
CREATES A DELAYED
10µs RESET PULSE
ON START-UP
OPTIONAL:
DISCHARGES C1
WHEN SUPPLY
IS DISCONNECTED
The LTC6993-1 provides a 10µS reset pulse to the LT6109-1.
The reset pulse is delayed by R7 and C1 whose time constant
must be greater than 10ms and longer than the supply
turn-on time. Optional components R8 and Q1 discharge
capacitor C1 when the supply and/or ground are discon-
nected. This ensures that when the power supply and/or
ground are restored, capacitor C1 can fully recharge and
trigger the LTC6993-3 to produce another comparator reset
pulse. These optional components are particularly useful
if the power and/or ground connections are intermittent,
as can occur when PCB are plugged into a connector.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

LT6109AIMS-2#PBF

Mfr. #:
Buy LT6109AIMS-2#PBF
Manufacturer:
Analog Devices Inc.
Description:
Current Sense Amplifiers Current Sense Amp with Reference and Comparators
Lifecycle:
New from this manufacturer.
Delivery:
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